Line data    Source code

       1             : // SPDX-License-Identifier: GPL-2.0
       2             : #include <linux/fs.h>
       3             : #include <linux/init.h>
       4             : #include <linux/proc_fs.h>
       5             : #include <linux/sched.h>
       6             : #include <linux/seq_file.h>
       7             : #include <linux/time.h>
       8             : #include <linux/time_namespace.h>
       9             : #include <linux/kernel_stat.h>
      10             : 
      11           0 : static int uptime_proc_show(struct seq_file *m, void *v)
      12             : {
      13           0 :         struct timespec64 uptime;
      14           0 :         struct timespec64 idle;
      15           0 :         u64 nsec;
      16           0 :         u32 rem;
      17           0 :         int i;
      18             : 
      19           0 :         nsec = 0;
      20           0 :         for_each_possible_cpu(i)
      21           0 :                 nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
      22             : 
      23           0 :         ktime_get_boottime_ts64(&uptime);
      24           0 :         timens_add_boottime(&uptime);
      25             : 
      26           0 :         idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
      27           0 :         idle.tv_nsec = rem;
      28           0 :         seq_printf(m, "%lu.%02lu %lu.%02lu\n",
      29           0 :                         (unsigned long) uptime.tv_sec,
      30           0 :                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
      31             :                         (unsigned long) idle.tv_sec,
      32             :                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
      33           0 :         return 0;
      34             : }
      35             : 
      36           1 : static int __init proc_uptime_init(void)
      37             : {
      38           1 :         proc_create_single("uptime", 0, NULL, uptime_proc_show);
      39           1 :         return 0;
      40             : }
      41             : fs_initcall(proc_uptime_init);